CASH, CASH EQUIVALENTS, AND MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2012

CASH, CASH EQUIVALENTS, AND MARKETABLE SECURITIES

Schedule of available-for-sale securities

The following is a summary of available-for-sale securities (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
At September 30, 2012
Money market funds	$	1,041	$	—	$	—		$	1,041
U.S. corporate debt securities		34,666		2		—			34,668
Debt securities issued by U.S. government and U.S. government agencies		89,224		22		(1	)		89,245
Marketable equity securities		16		15		—			31
Total	$	124,947	$	39	$	(1	)	$	124,985
At December 31, 2011
Money market funds	$	4,469	$	—	$	—		$	4,469
U.S. corporate debt securities		32,830		—		(1	)		32,829
Debt securities issued by U.S. government and U.S. government agencies		72,901		14		(2	)		72,913
Marketable equity securities		2,726		—		(907	)		1,819
Total	$	112,926	$	14	$	(910	)	$	112,030

Schedule of available-for-sale securities classified on balance sheet

The available-for-sale securities are classified on the balance sheet as follows (in thousands):

	Fair Value
	September 30, 2012		December 31, 2011
Amounts included in cash and cash equivalents	$	21,889	$	23,767
Marketable securities, current		103,065		86,444
Marketable securities, non-current		31		1,819
Total	$	124,985	$	112,030